Hello all. I’ve got a British Gas alarm system with a DSC keypad (PK5500 model). The trouble light has recently come on, and it says Device Low Battery. I take this to mean 1 or more wireless sensors have low battery, rather than the main 12V 7ah rechargeable battery. Is that right? It says zones 12. Firstly, does this mean zones 1 and 2, or zone 12? I assume 1 & 2 because I think I only have 8 or so sensors, def not 12. Also, how do I know which sensor corresponds to which zone (we moved into the flat after the alarm was installed unfortunately)? I’ve scoured the internet and it says to press ‘7’ once, twice or three times to see details, but it basically just bleeps and says there’s no problem. Pressing ‘1’ indicates ‘no service required.’ The keypad itself is new. Any help would be massively appreciated, don’t fancy the £85+ charge if it’s just a question of changing a sensor battery! Thanks all.